Determine the watering interval forfield which can be irrigated usings...
To determine the watering interval for a field irrigated using the surface method of irrigation, we need to consider several factors such as the discharge of the water source, available moisture holding capacity of the soil, depth of the root zone, irrigation efficiency, and peak daily moisture use.
Given data:
- Discharge of the water source: 1000 liters/minute
- Available moisture holding capacity of the soil: 180mm/m
- Depth of the root zone: 1.1m
- Irrigation is done when 40% of the available moisture is used
- Total losses during irrigation: 35%
- Peak daily moisture use: 4.5mm
Let's calculate the total available moisture in the root zone:
Total available moisture = Available moisture holding capacity of the soil x Depth of the root zone
Total available moisture = 180mm/m x 1.1m
Total available moisture = 198mm
Next, let's calculate the net irrigation requirement:
Net irrigation requirement = Total available moisture x (1 - irrigation efficiency) - Peak daily moisture use
Net irrigation requirement = 198mm x (1 - 35%) - 4.5mm
Net irrigation requirement = 198mm x 0.65 - 4.5mm
Net irrigation requirement = 128.7mm - 4.5mm
Net irrigation requirement = 124.2mm
Finally, let's calculate the watering interval:
Watering interval = Net irrigation requirement / Peak daily moisture use
Watering interval = 124.2mm / 4.5mm
Watering interval = 27.6 days
However, we need to consider that irrigation is done when 40% of the available moisture is used. So, the actual watering interval will be:
Actual watering interval = Watering interval / (1 - 40%)
Actual watering interval = 27.6 days / (1 - 40%)
Actual watering interval = 27.6 days / 60%
Actual watering interval ≈ 46 days
Therefore, the watering interval for the field is approximately 46 days. None of the given options (a, b, c, d) match the correct answer.
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